Answer:
A) the need to move quickly through dark environments
Explanation:
Both Dolphins and Bats have to create a system of echolocation because they needed a way to move on dark environmnets where they couldn´t see well enough, and the echolocation helped them to ubicate themselves through waves and reflection of those waves this created a new pair of "eyes" for them.
Answer:
There are 4 exresise ;endurance, strength, balance, and flexibility. Each one has different benefits.
Explanation:
Endurance activities, often referred to as aerobic, increase your breathing and heart rates.
Your muscular strength can make a big difference. Strong muscles help you stay independent and make everyday activities feel easier, like getting up from a chair, climbing stairs, and carrying groceries.
Balance exercises help prevent falls, a common problem in older adults that can have serious consequences.
Stretching can improve your flexibility. Moving more freely will make it easier for you to reach down to tie your shoes or look over your shoulder when you back your car out of the driveway.
hope this can help you...
Answer:
The answer to your question is:
Explanation:
Forehead = 6.0 kN
Cheekbone = 1.3 kN
m = 140 g = 0.14 kg
v = 30 m/s
t = 0.0015 s
a)
acceleration = v/t
a= 30/0.0015
a = 20000 m/s2
b)
F = ma
F = (0.14)(20000)
F = 2800 N = 2.8 KN
c) The force applied by the ball on my head must be the calculated (F = 2.8kN).
d)
My forehead is not in danger because 2.8kN < 6.0 kN
My cheekbone is in danger because 2.8 kN > 1.3 KN
Answer: option is C: the cross-section of the water decreases.
Explanation:
From the equation of continuity for in-compressible fluids (Bernoulli's equation),
a v = constant
where, a is the area and v is the velocity.
Also, pressure is inversely proportional to the velocity.
From the image, area of cross-section at A is greater than at B,
thus,
which means the velocity of water at B would increase and pressure of the water decreases. Hence, the correct option is C, i.e. the cross-section of the water decreases.
